Answer:
The answer is D. H+ increases in solution.
Explanation:
One water molecule gains a hydrogen and therefore takes on a positive charge, while the other water molecule loses a hydrogen atom and therefore becomes negatively charged.
More information:
(https://www2.nau.edu/lrm22/lessons/acids_and_bases/acids_and_bases.html#:~:text=One%20water%20molecule%20gains%20a,and%20it%20makes%20things%20acidic.)